Condition | Possible Sources | Actions |
|---|---|---|
Excessive hissing from the plenum when the A/C is on | Incorrect A/C refrigerant level | CHECK the A/C refrigerant level. REFER to: Refrigerant System Tests - 2.3L EcoBoost (201kW/273PS) (412-00 Climate Control System - General Information, General Procedures). REFER to: Refrigerant System Tests - 3.7L Duratec (227kW/301PS) (412-00 Climate Control System - General Information, General Procedures). REFER to: Refrigerant System Tests - 5.0L 32V Ti-VCT (412-00 Climate Control System - General Information, General Procedures). REFER to: Refrigerant System Tests - 5.2L 32V Ti-VCT (412-00 Climate Control System - General Information, General Procedures). |
Pinpoint Test(s)
P0532, P0533
Refer to Wiring Diagrams Cell 55 for schematic and connector information.
Normal operation and Fault Conditions
The A/C pressure transducer receives a ground from the PCM. A 5-volt reference voltage is supplied to the A/C pressure transducer from the PCM. The A/C pressure transducer then sends a voltage to the PCM to indicate the A/C pressure.
DTC Fault Trigger Conditions
DTC | Description | Fault Trigger Conditions |
P0532 A/C Refrigerant Pressure Sensor "A" Circuit Low | This DTC sets if the feedback voltage is less than 0.26 volt for at least 2 seconds and the ambient air temperature is greater than 0°C (32°F). | |
P0533 A/C Refrigerant Pressure Sensor "A" Circuit High | This DTC sets if the feedback voltage is greater than 4.95 volts for at least 2 seconds and the ambient air temperature is greater than 0°C (32°F). |
Possible Sources
Wiring, terminals or connectors A/C pressure transducer PCM
Visual Inspection and Diagnostic Pre-checks
Inspect for loose or corroded PCM and A/C pressure transducer connections.
PINPOINT TEST A : P0532, P0533
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
A1 COMPARE THE PCM (POWERTRAIN CONTROL MODULE) PRESSURE SENSOR (ACP_PRESS) PID (PARAMETER IDENTIFICATION) WITH THE MANIFOLD GAUGE SET READINGS
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